Influence of biological fluids in bacterial viability on different hospital surfaces and fomites

Area of Science:

• Microbiology
• Infection Control
• Environmental Hygiene

Background:

• Hospital environments are prone to bacterial contamination on surfaces and fomites.
• This contamination facilitates the spread of pathogenic bacteria.
• Understanding bacterial survival in these settings is crucial for infection control.

Purpose of the Study:

• To assess how biological fluids affect bacterial viability on common hospital fomites and surfaces.
• To identify which bacteria persist longest in a healthcare environment.

Main Methods:

• Four fomites/surfaces (ceramic floor, cotton, synthetic fibers, foam mattress) were inoculated with five pathogens (Staphylococcus aureus, Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa, Klebsiella pneumoniae).
• Inoculated surfaces were exposed to biological fluids (blood, urine, artificial saliva).
• Bacterial viability was quantified using colony-forming unit counts at 24 hours and subsequent 7-day intervals.

Main Results:

• Staphylococcus aureus demonstrated significant viability, persisting over 70 days across all tested conditions.
• Enterococcus faecalis and Klebsiella pneumoniae showed reduced viability over time.
• Escherichia coli did not display a clear growth correlation with surfaces or fluids.

Conclusions:

• The persistence and adaptability of pathogens on patient-exposed fomites and surfaces are critical factors in healthcare-associated infections.
• Findings inform the development of effective protocols for controlling and preventing microorganism dissemination in hospitals.
• Robust infection control strategies are necessary to mitigate risks posed by resilient bacterial strains.